Question

Give me proper answer

Answer 1

Answer:

Well, your set of quantum numbers is not "allowed" for a particular electron because of the value you have for  l , the angular momentum quantum number.

The values the angular momentum quantum number is allowed to take go from zero to  

n-1 ,  n

being the principal quantum number.

So, in your case, if  

n  is equal to 3, the values  l  must take are 0, 1, and 2. Since  l  is listed as having the value 3, this puts it outside the allowed range.

The value for  m l  can exist, since  m l , the **magnetic quantum number, ranges from  − l , to  +l .

Likewise,  

m s , the spin quantum number, has an acceptable value, since it can only be  − 1/2  or  + 1/2 .Therefore, the only value in your set that is not allowed for a quantum number is  l = 3 .